نتایج جستجو برای: pyrrole

تعداد نتایج: 3583  

Journal: :Acta crystallographica. Section C, Crystal structure communications 2006
H S Yathirajan R S Narasegowda D E Lynch T Narasimhamurthy R S Rathore

In 1-cyclohexyl-6,6,8a-trimethyl-3a,6,7,8a-tetrahydro-1H-1-benzofuro[2,3-b]pyrrole-2,4(3H,5H)-dione, C19H27NO3, (I), and the isomorphous compounds 6,6,8a-trimethyl-1-phenyl-3a,6,7,8a-tetrahydro-1H-1-benzofuro[2,3-b]pyrrole-2,4(3H,5H)-dione, C19H21NO3, (II), and 6,6,8a-trimethyl-1-(3-pyridyl)-3a,6,7,8a-tetrahydro-1H-1-benzofuro[2,3-b]pyrrole-2,4(3H,5H)-dione, C18H20N2O3, (III), the tetrahydroben...

Journal: :Molecules 2004
Justin M Holub Kathy O'Toole-Colin Adam Getzel Anthony Argenti Michael A Evans Daniel C Smith Gerard A Dalglish Shahzad Rifat Donna L Wilson Brett M Taylor Ulander Miott Josephine Glersaye Kam Suet Lam Bryan J McCranor Joshua D Berkowitz Robert B Miller John R Lukens Keith Krumpe John T Gupton Bruce S Burnham

A series of substituted 2-phenacyl-3-phenyl-1H-pyrrole-4-carboxylates were prepared from substituted acetophenones in 6 steps. The final condensations between a chloroenal and an aminoketone were carried out under neutral conditions in parallel to yield the series listed below. Selected pyrrole derivatives proved to be potent hypolipidemic agents lowering serum triglyceride concentrations in CF...

2010
Hee-Joon Kim

In the title compound, C(31)H(34)N(2)O(4), the two pyrrole rings are bent around the central methyl-ene C atom, making a dihedral angle of 64.83 (7)°. In the crystal, mol-ecules are linked into dimers via N-H⋯O=C hydrogen bonds. These dimers are packed through π⋯π inter-actions between neighboring pyrrole rings with a separation between the mean planes of symmetry-related pyrrole rings of 3.61 ...

Journal: :Dalton transactions 2011
Louise E Karagiannidis Philip A Gale Mark E Light Massimiliano Massi Mark I Ogden

The coordination chemistry of 2,5-dicarbothioamidopyrrole ligands, namely N2,N5-dibutyl-3,4-diphenyl-1H-pyrrole-2,5-bis(carbothioamide) and N2,N5,3,4-tetraphenyl-1H-pyrrole-2,5-bis(carbothioamide), has been investigated with Cu(II) metal centres by means of X-ray crystallography. This resulted in the formation of the expected planar S,N,S' coordinated complex for the former ligand and unexpecte...

2015
Antonio Bauzá David Quiñonero Antonio Frontera Pablo Ballester

In this manuscript we consider from a theoretical point of view the recently reported experimental quantification of anion-π interactions (the attractive force between electron deficient aromatic rings and anions) in solution using aryl extended calix[4]pyrrole receptors as model systems. Experimentally, two series of calix[4]pyrrole receptors functionalized, respectively, with two and four ary...

2015
Jasim Alshawi Muoayed Yousif Gregore Timco Inigo J. Vitorica Yrezabal Richard Winpenny Mohamad J. Al-Jeboori

The complete mol-ecule of the title compound, C26H30N4O4, is generated by crystallographic inversion symmetry. The dihedral angle between the planes of the benzene and pyrrole rings is 45.20 (11)°; the N atom bonded to the the benzene ring and the pyrrole N atom are in a syn conformation. The side chain adopts an extended conformation [N-C-C-C = 169.07 (17)° and C-O-C-C = -176.54 (17)°]. No dir...

2004
Thomas Lindel Gregor Breckle Matthias Hochgürtel Christian Volk Achim Grube Matthias Köck

Oxidative cyclization of the pyrrole–imidazole alkaloids oroidin and sventrin in DMSO/TFA (1:1) yields oxazolines via nucleophilic attack of the carbonyl oxygen at the alkenyl double bond. Oxidation takes place in the benzylic position of the imidazole ring. On prolonged reaction times, the oxazoline ring is hydrolyzed yielding the corresponding ester of pyrrole-2-carboxylic acid containing a f...

Journal: :Organic & biomolecular chemistry 2009
Christophe Berini Nadia Pelloux-Léon Frédéric Minassian Jean-Noël Denis

The stereoselective synthesis of penmacric acid, an optically active C-4 substituted pyroglutamic acid, has been efficiently achieved through an unusual 11-step sequence starting from simple N-triisopropylsilylpyrrole. The key-steps are the initial addition of the pyrrole nucleus onto a chiral nitrone and the obtention of the pyroglutamic acid moiety by reductive hydrogenation of the pyrrole fo...

1998
Jonathan L. Sessler Philip A. Gale John W. Genge

The preparation of two distinct calix[4]pyrrole-modified silica gels is reported. These systems, designed to investigate the binding characteristics of calix[4]pyrroles with anionic and neutral substrates, also provide a new solid support for the HPLC separation of nucleotides, oligonucleotides, N-protected amino acids and perfluorinated biphenyls. Binding affinities for the interaction of anio...

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